Add support for the object-position CSS property.

LayoutTests/animations/resources/animation-test-helpers.js

Index: LayoutTests/animations/resources/animation-test-helpers.js
diff --git a/LayoutTests/animations/resources/animation-test-helpers.js b/LayoutTests/animations/resources/animation-test-helpers.js
index 78238385f85adad7bc0512e81d30f75341d823e3..7cf8465427727af8670acd917d4d842731e3bfc7 100644
--- a/LayoutTests/animations/resources/animation-test-helpers.js
+++ b/LayoutTests/animations/resources/animation-test-helpers.js
@@ -367,6 +367,19 @@ function checkExpectedTransitionValue(expected, index)
         } else {
             pass = isCloseEnough(computedCrossFade.percent, expectedValue, tolerance);
         }
+    } else if (property == "object-position") {
+        computedValue = window.getComputedStyle(document.getElementById(elementId)).objectPosition;
+        var actualArray = computedValue.split(" ");
+        var expectedArray = expectedValue.split(" ");
+        if (actualArray.length != expectedArray.length) {
+            pass = false;
+        } else {
+            for (i = 0; i < expectedArray.length; ++i) {
+                pass = isCloseEnough(parseFloat(actualArray[i]), parseFloat(expectedArray[i]), tolerance);
+                if (!pass)
+                    break;
+            }
+        }
     } else {
         var computedStyle = window.getComputedStyle(document.getElementById(elementId)).getPropertyCSSValue(property);
         if (computedStyle.cssValueType == CSSValue.CSS_VALUE_LIST) {